The accident occurred in Providence on Sunday when the support apparatus for an aerial stunt suddenly gave way, dropping performers to the ground. Nine members of the troop were injured and two others were hurt on the ground.

But The Associated Press says:

"Providence Public Safety Commissioner Steven Pare stopped short of saying the broken carabiner was the cause of Sunday's accident.

"He said federal workplace safety investigators were trying to determine why it snapped.

" 'We don't know if it was metal fatigue, if it wasn't properly positioned or something else,' he added. 'We just don't know.' "